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Police officers are now working to identify the body and appealing for information about the incident.

Inspector Andy Storey said: "We would appeal to anyone who was driving on either the east or westbound carriageways of the M4 near junction 11 at around 2.50am to contact police as we are trying to determine the circumstances which led to a pedestrian being on the motorway.

“In addition there are ongoing enquiries to identify the pedestrian at this time.”